package org.apache.maven.cli.transfer;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;

import org.eclipse.aether.transfer.AbstractTransferListener;
import org.eclipse.aether.transfer.TransferCancelledException;
import org.eclipse.aether.transfer.TransferEvent;
import org.eclipse.aether.transfer.TransferResource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Slf4jMavenTransferListener extends AbstractTransferListener {

  protected final Logger out;

  public Slf4jMavenTransferListener() {
    this.out = LoggerFactory.getLogger(Slf4jMavenTransferListener.class);
  }

  // TODO should we deprecate?
  public Slf4jMavenTransferListener(Logger out) {
    this.out = out;
  }

  @Override
  public void transferInitiated(TransferEvent event) {
    String message = event.getRequestType() == TransferEvent.RequestType.PUT ? "Uploading" : "Downloading";

    out.info(message + ": " + event.getResource().getRepositoryUrl() + event.getResource().getResourceName());
  }

  @Override
  public void transferCorrupted(TransferEvent event) throws TransferCancelledException {
    TransferResource resource = event.getResource();

    out.warn(event.getException().getMessage() + " for " + resource.getRepositoryUrl() + resource.getResourceName());
  }

  @Override
  public void transferSucceeded(TransferEvent event) {
    TransferResource resource = event.getResource();
    long contentLength = event.getTransferredBytes();
    if (contentLength >= 0) {
      String type = (event.getRequestType() == TransferEvent.RequestType.PUT ? "Uploaded" : "Downloaded");
      String len = contentLength >= 1024 ? toKB(contentLength) + " KB" : contentLength + " B";

      String throughput = "";
      long duration = System.currentTimeMillis() - resource.getTransferStartTime();
      if (duration > 0) {
        DecimalFormat format = new DecimalFormat("0.0", new DecimalFormatSymbols(Locale.ENGLISH));
        double kbPerSec = (contentLength / 1024.0) / (duration / 1000.0);
        throughput = " at " + format.format(kbPerSec) + " KB/sec";
      }

      out.info(type + ": " + resource.getRepositoryUrl() + resource.getResourceName() + " (" + len + throughput + ")");
    }
  }

  protected long toKB(long bytes) {
    return (bytes + 1023) / 1024;
  }

}
